metainfo/pieces.go

   1 package metainfo
   2
   3 import (
   4         "crypto/sha1"
   5         "io"
   6 )
   7
   8 func GeneratePieces(r io.Reader, pieceLength int64, b []byte) ([]byte, error) {
   9         for {
  10                 h := sha1.New()
  11                 written, err := io.CopyN(h, r, pieceLength)
  12                 if written > 0 {
  13                         b = h.Sum(b)
  14                 }
  15                 if err == io.EOF {
  16                         return b, nil
  17                 }
  18                 if err != nil {
  19                         return b, err
  20                 }
  21         }
  22 }